:root {
    --color-primary: #1a3c27;
    --color-secondary: #2d5a3f;
    --color-accent: #d4a853;
    --color-background: #f5f0e8;
    --color-text: #2c2c2c;
    --color-text-light: #5a5a5a;
    --color-white: #ffffff;
    --color-code-bg: #f0f0f0;
    --color-border: #e0e0e0;
    --shadow-sm: 0 2px 8px rgba(26, 60, 39, 0.08);
    --shadow-md: 0 4px 16px rgba(26, 60, 39, 0.12);
    --shadow-lg: 0 8px 32px rgba(26, 60, 39, 0.16);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.8;
    overflow-x: hidden;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(245, 240, 232, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo svg {
    width: 28px;
    height: 28px;
    color: var(--color-accent);
}

.nav-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: var(--transition-fast);
}

.nav-back:hover {
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.nav-back svg {
    width: 20px;
    height: 20px;
}

/* Article Header */
.article-header {
    padding: 8rem 0 3rem;
    text-align: center;
}

.article-category {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-white);
    padding: 0.35rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.article-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 2.5rem;
    color: var(--color-primary);
    line-height: 1.4;
    margin-bottom: 1.5rem;
}

.article-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    color: var(--color-text-light);
    font-size: 0.95rem;
    flex-wrap: wrap;
}

.article-meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.article-meta-item svg {
    width: 18px;
    height: 18px;
}

.article-tags {
    display: flex;
    gap: 0.5rem;
    margin-top: 1.5rem;
    justify-content: center;
}

.article-tag {
    background: var(--color-background);
    color: var(--color-primary);
    padding: 0.35rem 0.85rem;
    border-radius: 8px;
    font-size: 0.9rem;
    border: 1px solid var(--color-border);
}

/* Article Content */
.article-body {
    background: var(--color-white);
    border-radius: 20px;
    padding: 3rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-md);
}

.article-body h2 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.75rem;
    color: var(--color-primary);
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-accent);
}

.article-body h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.35rem;
    color: var(--color-secondary);
    margin: 2rem 0 0.75rem;
}

.article-body h4 {
    font-size: 1.15rem;
    color: var(--color-text);
    margin: 1.5rem 0 0.5rem;
}

.article-body p {
    margin-bottom: 1.25rem;
    color: var(--color-text-light);
    text-align: justify;
}

.article-body ul,
.article-body ol {
    margin: 1rem 0 1.5rem 1.5rem;
    color: var(--color-text-light);
}

.article-body li {
    margin-bottom: 0.5rem;
}

.article-body strong {
    color: var(--color-primary);
    font-weight: 600;
}

.article-body code {
    background: var(--color-code-bg);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9em;
    color: var(--color-primary);
}

.article-body pre {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 1.5rem;
    border-radius: 12px;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.article-body pre code {
    background: transparent;
    color: var(--color-white);
    padding: 0;
}

.article-body blockquote {
    background: var(--color-background);
    border-left: 4px solid var(--color-accent);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: var(--color-text-light);
}

.article-body blockquote p {
    margin-bottom: 0;
}

.article-body hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    margin: 2rem 0;
}

.article-body img {
    max-width: 100%;
    border-radius: 12px;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-sm);
}

/* Article Footer */
.article-footer {
    background: var(--color-white);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.article-nav {
    display: flex;
    gap: 1rem;
}

.article-nav a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary);
    text-decoration: none;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: var(--transition-fast);
}

.article-nav a:hover {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.article-nav a svg {
    width: 20px;
    height: 20px;
}

.article-share {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Footer */
.footer {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 3rem 0 2rem;
    text-align: center;
}

.footer-icp {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.footer-icp a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

.footer-icp a:hover {
    text-decoration: underline;
}

.footer-text {
    font-size: 0.9rem;
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.footer-divider {
    width: 60px;
    height: 2px;
    background: var(--color-accent);
    margin: 2rem auto;
}

.footer-copyright {
    font-size: 0.85rem;
    opacity: 0.7;
}

.footer-police {
    font-size: 0.9rem;
    margin-top: 0.75rem;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.footer-police a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

.footer-police a:hover {
    text-decoration: underline;
}

.footer-police img {
    width: 16px;
    height: 17px;
    vertical-align: middle;
}

/* Scroll to top */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-normal);
    z-index: 100;
}

.scroll-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.scroll-top:hover {
    background: var(--color-secondary);
    transform: translateY(-2px);
}

.scroll-top svg {
    width: 24px;
    height: 24px;
}

/* Reading Progress Bar */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--color-accent);
    z-index: 1001;
    transition: width 0.1s ease;
}

/* Responsive */
@media (max-width: 768px) {
    .article-title {
        font-size: 1.75rem;
    }

    .article-body {
        padding: 2rem 1.5rem;
    }

    .article-body h2 {
        font-size: 1.4rem;
    }

    .article-body h3 {
        font-size: 1.2rem;
    }

    .article-meta {
        gap: 1rem;
    }

    .article-footer {
        flex-direction: column;
        text-align: center;
    }

    .article-nav {
        flex-direction: column;
        width: 100%;
    }

    .article-nav a {
        justify-content: center;
    }
}